Update dependency highlight.js to ^9.18.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
highlight.js (source)	dependencies	minor	^9.18.0	homepage, source

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Release Notes

highlightjs/highlight.js

v9.18.0

Compare Source

New languages:

• none.

New themes:

• none.

Core Changes:

• none.

Language Improvements:

• (javascript) fix JSX self-closing tag issues (#​2322) Josh Goebel
• (fortran) added block and endblock keywords (#​2343) Philipp Engel
• (javascript) support jsx fragments (#​2333) Josh Goebel
• (ini) support TOML arrays, clean up grammar (#​2335) Josh Goebel
• (vbnet) add nameof operator to the keywords (#​2329) Youssef Victor
• (stan) updated with improved coverage of language keywords and patterns. (#​1829) Jeffrey Arnold
• enh(cpp) Detect namespaced function types (A::typeName func(...)) (#​2332) Josh Goebel
• enh(cpp) Detect namespaced functions also (A::functionName) (#​2332) Josh Goebel
• enh(cpp) Properly detect decltype(auto) (#​2332) Josh Goebel
• enh(cpp) recognize primitive types (int8_t, etc.) as function types (#​2332) Josh Goebel

Developer Tools:

• feat(developer): add button to show parsed structure (#​2345) Nils Knappmeier

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